A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava, tephra, pumice, and volcanic ash.nlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic explosive eruptions and effusive eruptions, although some have collapsed craters called calderas. The lava flowing from stratovolcanoes typically cools and hardens before spreading far due to high viscosity.
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Longitudinal Wave. A wave is a disturbance of a medium which transports energy through the medium without permanently transporting matter. In a wave, particles of the medium are temporarily displaced and then return to their original position.n this type of wave-a longitudinal wave-the particles of the medium vibrate in a direction parallel to the direction of energy transport. For more information on physical descriptions of waves, visit The Physics Classroom Tutorial. Detailed information is available there on the following topics: